writeOpticalFlowToFile   59 modules/video/test/test_tvl1optflow.cpp     void writeOpticalFlowToFile(const Mat_<Point2f>& flow, const string& fileName)
writeOpticalFlowToFile  126 samples/cpp/tvl1_optical_flow.cpp static void writeOpticalFlowToFile(const Mat_<Point2f>& flow, const string& fileName)